When does your own health outweigh the elders health?

My mother defends her abusing children and grand children that live under her roof with her support. One is her daughter with power of attorney, as she says she has all the power! My mother defends everything mind you she is a Narcissist. Protective elder service is in the picture now and I want out. I don't want to waste my time fighting a losing battle where she does not care she is being abused and ripped off. I am not spending 15K for a lawyer for someone who does not want help.This is destroying my mental health and physical health. When does one say I have done what I could and cut the ties that bind??????